Spark plug having a sectional center electrode and a thin metallic sleeve surrounding the lower portion thereof



2 Sheets-Sheet 1 IIW Fig.2

Dec. 17, e. F. TAYLOR SPARK PLUG HAVING A SECTIONAL CENTER ELECTRODE AND A THIN METALLIC SLEEVE SURROUNDING TgE LOWER PORTION THEREOF 196 Original Filed Jan. 11,

Dec. 17, 1O8 G. F. TAYLOR 3,417,275

SPARK PLUG HAVING A SECTIONAL CENTER ELECTRODE AND A THIN METALLIC SLEEVE SURROUNDING THE LOWER PORTION THEREOF Original Filed Jan. 11, 1962 2 Sheets-Sheet z Fatented Dec. 17, 1968 FIGURE 1 has been replaced by a tightly-packed plug 3,417,275 19 made of metallic wool and tube 17 has been replaced SPARK PLUG HAVING A SECTIONAL by rod 17B having an outwardly extending tip 20. The

TER ELECTRODE AND A THIN METALLIC plug 19 is in electrical contact with channelled rod 178 HSIIIJ(%UNDING THE LOWERPOR- and cap member In FIGURES 3 and 4 metal connector cap 100 is se- 25 f gggg i gg%g g ;g igrga gififi 232335;: cured to porcelain body 101 by means ot a screwthreaded British Columbia, Canada, a corporation of British Connectlon a Sealing gasket 104 belng POSltlOned Columbia tween shoulder 104 on cap 100 and the upper end of Continuation of application Ser. No. 165,625, Jan. 11, 10 porcelain body 101. The carbon pole of the structure 1962, which is a continuation of application Ser. No. Shown i FIGURE 1 h b l d i FIGURE 3 556,386, y 1966- ThiS application y 1967, by a channelled member such as metal tube 105. Aper- S 640,426 tured or channelled electrode tip 106 is welded endwise 1 Claim. (Cl. 313-136) of and within aperture 107 in tube 105 thereby sealing The present invention relates to spark plugs and in the lower end of the aperture. The apertures in electrode fiwlar to aerated spark Plugs designed for under 3,3611%? iefi ihlils ol fh5365a???J22 21125 3151: high pressure conditions such as those encountered in jet thereof g g enginfzs and.hi5.h CPmPreSSiPH ailtomotive engiilcs' Aperture 109 in cap 100 is in alignment with aperture E'hxs zgpphlcltloglgg gs 6 f i l gg i li 5 5 22 22; 107 in tube 105, the one aperture extending into the other, 3 if a cgntixmation reviews appliczk the two apertures being loaded with a conglomerate 110 gg NO 165 625 filed Jan 11 g ,lbandoned formed of conducting materials such as carbon granules, The inventiomconsists in the particular arrangement i lgg g and metal granules elther layered or m i p p gigg i gg g described and The spark plugs of the present invention which have e 5 Q f 1 Hows referen'ce will be had apertured connecting caps and tubular electrode tips with to 3 i zi z g g drawilfgs in which porous electrode poles therebetween retain their conduc- FIGURE s agsectional elevation a spark plug t1ve properties for extremely long perlods of time and are in addition capable of withstanding extremely high constructed according to the lnventron, cylinder ressures FIGURE 2 is an elevation partly in section of another p embodiment of the invention' I claim:

1. A spark plug having a hollow electrically insulating FIGURE! 3 IS an eleyanon. partly In Section of a fur body, a sectional electrode formed in said body including ther embodiment of the invention; and

at least an upper electrode section, a central electrode sec- FIGURE 4 1s a Sectional elevatlon of the electrode tion and a lower electrode section, said upper section beassembly of FIGURE 3 on an enlarged scale.

. ing a connecting cap and having means for carrying cur- In the drawings the Spark.p1ug 1 compnstis the Convfin rent therethrough to the central section and being in electlonal metal Jacket 2 carrying usual i electrical connection with said central section the central ai 1 1 5:5 i g 222 52 15 y 23 section being positioned within said insulating body and W1 In me lac e W y packed with a porous electrically conducting material and squared as in FIGURE 1 or sloped or rounded as In l FIGURES 2 d 3 suitable sealin askets 6 and said lower electrode section having an inner end located vent the escap e of ases between thfi ivall of the porcelain Within Said insulating body and an Outer end positioned g y 4 and the metaljacket 2. near a ground electrode of the plug, said lower electrode a section comprising a rod of electrically conducting mateat g gg gi giggg gig iggi igg g iig i gg $22323 4r rial and a thin metallic sleeve of electrically conducting s to the C under head Shown) material surrounding the rod and adjacent thereto from 3 bodznents Shown in FIGURES'I and 7 metal said inner end to said outer end, the inner ends of both n e em I the rod and the sleeve being in electrical contact with the connector cap 10 1S centrally apertured or channelled at said porous electrically conducting material of the cen- 11 over its entire length. A screw threaded connection 12 val Section Said lower electrode Section having '1 is provided between the connectors 10 and the porcelain p A rality of relatively small channels formed therein and exbodles A shpulder 13 on 10 abuts h upper tending longitudinally thereof from said inner end to end of porcelain body 4, a sealing gasket 14 being promid Outer and vided between the cap 10 and the porcelain body.

FIGURE 1 shows a carbon pole 15 mounted within a R f rences Cited metal cylinder 15A positioned in hollow porcelain body 4, UNITED STATES PATENTS on shoulder 16. An apertured or channelled electrode ber o tip such as tube 17 is mounted in the lower 1,479,645 1/1924 Blomster 313*141 2,296,033 9/1942 Heller 313-436 X portlon of the porcelain body and terminates beyond the 2 946 912 0 end of the porcelain at a point adjacent to but not touch- 7 196 Chnstenson I 313 141 i grounded electrode 3. It will be noted that carbon pole i 'g Rhoiie 313 137 X 15 i enetrated at its lower end by tube 17 and at its 2891187 41 2 g 313-443 X upper end by a tubular metallic extension 18 on cap 10. 9 9 retsch et 313-136 In addition the plug of FIGURE 1 has been provided with HERMAN KARL SAALBACH Primary Emmmer a thin metallic electrode sleeve 17A between porcelain bodies 4 and the apertured or channelled electrode 17. CHATMON, Assistant Examine"- The embodiment of the invention shown in FIGURE 2 is in structure substantially the same as that of FIG- URE 1. However in FIGURE 2 the carbon pole 15 of 3l3-l39; 3l538.1 

1. A SPARK PLUG HAVING A HOLLOW ELECTRICALLY INSULATING BODY, A SECTIONAL ELECTRODE FORMED IN SAID BODY INCLUDING AT LEAST AN UPPER ELECTRODE SECTION, A CENTRAL ELECTRODE SECTION AND A LOWER ELECTRODE SECTION, SAID UPPER SECTION BEING A CONNECTING CAP AND HAVING MEANS FOR CARRYING CURRENT THERETHROUGH TO THE CENTRAL SECTION AND BEING IN ELECTRICAL CONNECTION WITH SAID CENTRAL SECTION, THE CENTRAL SECTION BEING POSITIONED WITHIN SAID INSULATING BODY AND PACKED WITH A POROUS ELECTRICALLY CONDUCTING MATERIAL AND SAID LOWER ELECTRODE SECTION HAVING AN INNER END LOCATED WITHIN SAID INSULATING BODY AND AN OUTER END POSITIONED NEAR A GROUND ELECTRODE OF THE PLUG, SAID LOWER ELECTRODE SECTION COMPRISING A ROD OF ELECTRICALLY CONDUCTING MATE- 